Cod sursa(job #2036700)

Utilizator AndreiG23Ghiurcuta Andrei AndreiG23 Data 10 octombrie 2017 23:11:23
Problema Sortare prin comparare Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
bool prim[100000001];
int main()
{long long n;int nr=0;
   fin>>n;
   for(int i=2;i<=n;i++)
   {
       if(!prim[i])
           for(int j=i+i;j<=n;j+=i)
           prim[j]=1;


       if(prim[i]==0)++nr;
   }
    fout<<nr;

}